Just to clarify something else for you: the theory for the step forward is essentially creating momentum for your return of serve. It's not universally accepted as proper technique. Everyone has a routine that they like. Generally speaking:

Djokovic has a low wide base, then raises up, then splits.

Nadal likes to stutter step rapidly, then splits.

Murray steps forward then splits.

Tomic stands there, uninterested, and then splits.

Rosol dances, and then splits.

And so on ...

All of them will vary their routines based on their reads or their preselected tactic for the return.

For me, the forward momentum is not necessary for most returns. It's an extra movement that I would rather do without, but sometimes I still do it (mainly on second serves).

Come to think about it, I almost always do it on second serves, but that's mainly b/c I'm expecting to be able to kill that serve with the ros (usually a FH ros). That's not the case against very good first serves (be them flat or sliced, etc), is it?